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Abstract

We study supercontinuum (SC) generation in sapphire pumped by two femtosecond lasers with dual wavelengths of 800 nm and 1054 nm. In comparison with the case pumped by single-wavelength pulses, the conversion efficiencies in the visible and infrared regions are enhanced by almost an order of magnitude, and the SC spectrum can be much flatter with dual-wavelength pulses pumping. The ultrabroad SC spanning from 350 nm to 1600 nm is obtained experimentally, which covers an octave of the pumping wavelengths.

Figures (2)

The measured SC spectra with dual-wavelength pumping for different pump conditions: The two pump pulses are completely separated, and the pump pulse energy at 800 nm is 8 µJ in this case (black line); the two pump pulses are temporally overlapped and the pump pulse energy at 800 nm is 3 µJ (green line) or 8 µJ (red line). Pump pulse energy at 1054 nm is fixed at 22 µJ. All the spectra are normalized to the maximum peak of the SC spectrum generated by the two temporally separated pulses.